Grinding disk



, June 26, 1934.

l. R. sHUE GRINDINGDISK Original Filed May 25 1931 Patented June 26, 1934 UNITED STATES GRINDING DISK Ingle R Shue, Beloit, Wis., assignor to Gardner Machine Company, Beloit, Wis., a corporation of Illinois Original application May 25, 1931, Serial No. 539,859. Divided and this application August 10, 1931, Serial No. 556,048

6 Claims. (01. 51-209) The present application is a division of applicants copending application, Serial No. 539,859, filed May 25, 1931.

The invention relates generally to grinding wheels, and more particularly to wheels of the disk type.

The general object of the invention is to provide a new and improved grinding disk which may be readily attached to a supporting wheel, which is strong and not subject to cracking, and which is so constructed that a maximum use of the abrading material is possible.

More specifically, the object is to provide a grinding disk of this character adapted to be bolted to a supporting wheel, and having a strengthening means moulded therein which is adapted to distribute the stress on the disk over the entire fiat area thereof, said strengthening means being so positioned in the abrading material that the major part of the latter is available for use. Other objects and advantages will'b'ecome apparent from the following description taken in connection with the accompanying drawing, in which:

Figure 1 is a perspective view, partially broken away, of a supporting wheel and grinding disk assembly embodying the features of the invention.

Fig. 2 is an enlarged fragmentary sectional view thereof.

Fig. 3 is a view similar to Fig. 2, but showing a modified form of securing means.

Fig.4 is a perspective view of-one of the securing members shown in Fig. 3.

While the invention is susceptible of various modifications and alternative constructions, I have shown in the drawing and will herein describe in detail the preferred embodiment, but it is to be understood that I do not thereby limit the invention to the specific form disclosed but intend to cover all modifications and alternative constructions falling within the spirit and scope of the invention as expressed in the appended claims.

The present embodiment of the invention comprises generally a supporting wheel which is adapted to be secured to a driving means, and a grinding disk made of abrading material and positioned with the rear face against the supporting wheel. Embedded in this face of the grinding disk and coextensive therewith is a means for strengthening the abrading material. Means is provided for clamping the grinding disk to the supporting wheel whereby the stresses will be resisted and absorbed by the strengthening means in order to distribute said stresses over the whole area of the abrading material.

As shown in the drawing, a supporting wheel 10 is provided which is adapted to be secured to a driving means, as by screws (not shown) passing through the holes 11 and adapted to be threaded into a flange on the driving spindle of a grinding machine (not shown). Positioned with the rear face against the supporting wheel 10, is a grinding disk indicated generally at 12 made of abrading material.

To strengthen the grinding disk 12 and to prevent any part of it from cracking due to excessive strains or to expansion; means is provided which isembedded or molded in the material composing the disk. In the present instance,

this means comprises a mesh 13 preferably of wire which is embedded in the rear face of the disk 12, and which extends to theperiphery of said disk so that the edge of the latter will not crack off. The molded material fills the interstices of the wire mesh so as to form an intimate bond therewith. While wire mesh is illustrated herein, it is contemplated that expanded metal or other reticulated material may be used in its stead. By positioning the wire mesh in the rear or inner face of the grinding disk, a maximum use of the abrading material is permitted before the disk need be discarded or before additional abrading material need be molded thereon.

In the exemplary form shown in the drawing the disk is made in two layers of difierent' composition, the strengthening and securing means being molded in the rear and stronger layer. This feature forms the subject matter of another application.

As mentioned above, the invention also includes means for clamping the grinding disk 12 to the supporting wheel 10 whereby the torsio'nalstress, when the wheel is driven, will be transmitted from the supporting wheel directly to the strengthening means in order to distribute this stress over the whole transverse area of theabrading material, and also the internal stresses due to centrifugal forces will be resisted. By such distribution of the stresses, there is no localization of the latter at definite pointswhich might tend to crack the abrading material, especially adjacent the periphery thereof.

- In the preferred form, the clamping means or securing members comprise a plurality of nuts 1'4 arranged in spaced relation over the area of the grinding disk. Each nut bears against the inner face of the wire mesh and preferably is relatively thin so that it will not extend beyond the thickness of the mesh to any great extent and thus prevent a maximum use of the abrading material. In the present instance, the nut is shown as square although any non-circular shape may be used.

Threaded into the nuts 14 are screws 15 which pass through the supporting wheel 10 and through interstices in the wire mesh. The interstices of the wire mesh are preferably of such size that one will just permit a screw 15 to pass therethrough. Thus, the wires of the mesh need not be cut. When the screws 15 are tightened, the grinding disk 12 is clamped against the sup-1 porting wheel 10, and the wire mesh 13 being clamped'between the supporting wheel and the nuts, receive the torsional stress directly from the supportingwheel because of the clamping pressure. Bymeans of the wire mesh, the stress is then transferred to the abrading material throughout the whole area thereof. Thus, no torsional stress is localized at the screws and nuts which would tend to crack the abrading material, and also the internal stresses due to centrifugal forces will be uniformly resisted.

In the modified form of disk shown in Fig. 3, each securing member comprises a nut, indicated generally at 20, shaped to interlock with the wires of the mesh to prevent rotation of the nut relative to the mesh. In the present instance, each nut has a flanged portion 21, which bears against the wires forming an interstice in the mesh, and a reduced portion 22 which fits within said interstice. With this type of nut, the flanged portion 21 may be quite thin so that a greater portion of the disk is available for use, while the reduced portion 22 together with the flanged portion 21 provide a sufficient length of thread for the screws 15.

From the above description, it will be apparent that I have-provided a grinding disk which may be readily attached to a supporting wheel by means of the screws 15 and nuts 14 or 20, the interstices in the mesh being properly positioned to aline with the holes in the supporting wheel. By placing a wire mesh'in the disk which is coextensive therewith, the disk is strong and will not be subject to cracking. Since the mesh and nuts are embedded only in the rear face of the disk and their thickness is relatively small, the usable portion forms the major part of the disk.

I claim as my invention:-

1. A grinding wheel comprising, in combination, a supporting wheel, a grinding disk made of abrading material, a wire mesh embedded in said abrading material, a plurality of nuts embedded in said abrading material, each nut bearing against the strands of wire forming the sides of a single interstice of the mesh, and a plurality of screws threaded into said nuts and extending through the supporting wheel, each screw extending through the individual interstice over which its nut extends, said interstices being dimensioned to receive the respective screws without cutting any of the wires of the mesh.

2. A grinding wheel comprising, in combination, a supporting wheel, a grinding disk made of abrading material and positioned with one face against said supporting wheel, a wire mesh embedded in said face of said abrading material, a plurality of nuts bearing against the inner face of said wire mesh, and screws each extending through an individual interstice of said mesh and threaded into said nuts for clamping said mesh against the face of said supporting wheel.

3. A grinding element adapted to be secured to the face of a supporting wheel comprising, in combination, a disk made of abrading material, a wire mesh embedded in said abrading material, and a plurality of nuts embedded in said abrading material in spaced relation and adapted to be secured to said supporting disk, each of said nuts comprising a portion fitting in an interstice of said mesh and a second portion of larger size bearing against the wires forming said interstice. I

4.'A grinding element adapted to be secured to the face of a supporting wheel comprising, in combination, a disk made of abrading material, a wire mesh embedded in the rear face of said disk, and a plurality of nuts bearing against the inner face of said mesh and embedded in said abrading material, each of said nuts being relatively thin to occupy a minimum portion of the thickness of said disk and having a reduced portion extending into an interstice of said mesh to provide a substantial length of thread.

' 5. A high-speed, heavy-duty grinding wheel 105 comprising, in combination, a rigid supporting 'wheel, a grinding disk of molded material positioned against one face of said supporting wheel, and means for removably securing said disk to said wheel and for reinforcing said disk against centrifugal stresses in operation, comprising a sheet of coarse wire mesh embedded in the molded disk adjacent the rear face thereof, a pmrality of nuts embedded in spaced relation in the molded disk and overlying the inner face of said wire mesh, and a plurality of screws, one

for each nut, passing from rear to front through apertures in said supporting wheel and threaded into the respective nuts, said wire mesh being composed of heavy strands woven to form large 12o interstices which are dimensioned so that each of said screws may pass through an individual interstice without severance of any of such strands and so that each of said nuts overlies .the strands of the'mesh which together form the sides of a single interstice, the tightening of said screws acting to clamp the mesh-sheet and the molded disk as aunit to said supporting wheel, said mesh-sheet lying substantially in a plane without sharp bends in the sheet and 30 thereby serving to afford maximum resistance to centrifugal stresses in the disk by linear tension of the individual strands of said sheet.

6. A grinding element adapted to be secured to the face of a supporting wheel comprising, in combination, a disk made of abrading material, a wire mesh embeddedin said abrading material, and a plurality of nuts embedded in said abrading material in a predetermined arrangement and adapted to be secured to said supporting wheel, each of said nuts bearing against the wires forming an interstice of the mesh and being shaped to interlock with said wires to prevent rotation of the nut relative to the mesh.

. INGLE R. SHUE. 

